Dr. Mohammad Hajarian is a Marie Curie Postdoctoral Fellow and Assistant Professor at Universidad Carlos III de Madrid, where he leads the EU-funded ROSNUB project. He is also the CEO and Founder of Gegli (Gohardasht), one of the pioneering social networks he launched in 2003. With over 50 publications, including articles and books, Dr. Hajarian has made significant contributions across disciplines such as Online Social Networks, Gamification, Human-Computer Interaction, Interaction Design, Recommendation Systems, Personalization, User Engagement, Data Science, and User Acquisition. His research currently focuses on developing methods to fight misinformation and mitigate online hostility within social networks. He has taught over 35 courses and supervised numerous graduate and postgraduate theses. His innovative work has been widely adopted in the social media and software industry. He collaborates with fellow researchers through his social network platform to implement and validate cutting-edge methods in real-world environments. He has also participated in several industrial software projects and actively collaborates on various Horizon Europe and industry-driven projects. He frequently serves as a reviewer and editor for leading scientific journals and conferences. He also speaks and presents papers, workshops, and tutorials at major conferences and universities. In recognition of his contributions, Dr. Hajarian has received several prestigious awards and honors.